THE EFFECT OF SPECIMEN SIZE ON THE BENDING STRENGTH OF UNIDIRECTIONAL CARBON FIBER-EPOXY

被引：87

作者：

WISNOM, MR

机构：

[1] Department of Aerospace Engineering, University of Bristol, Bristol

来源：

COMPOSITE STRUCTURES | 1991年 / 18卷 / 01期

关键词：

D O I：

10.1016/0263-8223(91)90013-O

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

Four-point bending and pinned-end buckling tests were carried out on scaled specimens of 25, 50 and 100 plies. Both types of test gave similar results and showed a significant decrease in strength with increasing specimen size. The smaller specimens tended to fail progressively in tension. The tensile strain to failure decreased by about 8% for each doubling of specimen size. This corresponds to a Weibull modulus of about 25. However the amount of scatter in the results was much smaller than that expeceted based on Weibull strength theory. The larger specimens tended to fail catastrophically in compression. This suggests a reduction in compressive strength with specimen size which may be even larger than the reduction in tensile strength.

引用

页码：47 / 63

页数：17

共 10 条

[1]

Metcalfe, Schmitz, Effect of length on the strength of glass fibres, (1964)

[2]

Bader, Priest, Statistical aspects of fibre and bundle strength in hybrid composites, Proceedings of the 4th International Conference on Composite Materials, pp. 1129-1136, (1982)

[3]

Weibull, A statistical distribution function of wide applicability, J. Applied Mechanics, 18, (1951)

[4]

Hitchon, Phillips, The effect of specimen size on the strength of cfrp, Composites, 9, pp. 119-124, (1978)

[5]

Bullock, Strength ratios of composite materials in flexure and in tension, J. Composite Materials, 8, pp. 200-206, (1974)

[6]

Kies, The strength of glass fibers and failure of filament wound pressure vessels, NRL Report No. 6034, (1964)

[7]

Kretsis, Matthews, Morton, Davies, Flexural behaviour of unidirectional glass-carbon hybrid laminates, Proceedings of the International Symposium on Composites, pp. 421-432, (1986)

[8]

Batdorf, Ghaffarian, Size effect and strength variability of unidirectional composites, Int. J. Fracture, 26, pp. 113-122, (1984)

[9]

Wisnom, Limitations of linear elastic bending theory applied to four point bending of unidirectional carbon fibre/epoxy, Proceedings of the AIAA Structures, Structural Dynamics and Materials Conference, pp. 740-747, (1990)

[10]

Whitney, Daniel, Pipes, Experimental Mechanics of Fiber Reinforced Composite Materials, (1984)

← 1 →